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Two things come to mind:
1. This set is a commercial set meant for a school or other industrial application. Back in the '80's, my elementary school had several 23" RCA tube-type color TV's from the late '60's-early '70's with all sorts of weird video input jacks. All of the TV's were on roll around metal carts and had U-Matic video tape players connected to the video input jacks.
2. This could have been designed for use as a computer monitor for use with computers of that time.
BTW, look at the chassis number. If this TV uses the BC chassis, you may want to go ahead and order a spare flyback. That chassis was made by Matsushita (Panasonic) and flyback failures were very common. They usually blew a hole in the side of the transformer and stunk up the room.
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